Question about Layout

[texus]

Question about Layout

[texus]

I don't think the performance is that important, the string isn't evaluated every frame, only when you actually change the size or position of a widget. Performance can always be improved in the future, initially the most important thing is that it works.

What exactly do you mean by using lambda expressions? Using them where? Could you give a small example?

[klusekrules]

Now to counting dynamically we must write something like that:

label->setPosition({ "{&.h+(&.w-&.h-20)*0.715+5,3+(&.h-10)*0.05}" });

The same code with lambda expression:

label->setPosition({ [label]()->float { 
            auto w = label->getParent()->getSize().x;
            auto h = label->getParent()->getSize().y;
            return h + (w - h - 20) * 0.715 + 5;
        } },{ [label]()->float {
            auto h = label->getParent()->getSize().y;
            return 3 + (h - 10) * 0.05;
        }});

When we used to this lambda expression we have more possibilities. In lambda expression we can use function which we want. And there is no need to use parser.

[texus]

At first I thought this was a great idea, it wouldn't even be that hard to implement. But then I realized that it can't work: there is no way the label could know when to recalculate its position.

[klusekrules]

What a pity! I see, we would have to manually add the signals, but it cause obfuscated code and it is potential place to make a mistake.